Properties of the Number 81428

Eighty-One Thousand Four Hundred Twenty-Eight

Basics

Value: 81427 → 81428 → 81429

Parity: even

Prime: No

Previous Prime: 81421

Next Prime: 81439

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 2 ² × 20357

Divisors: 1, 2, 4, 20357, 40714, 81428

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

8509 Try Today's Challenge

Representations

Binary: 10011111000010100

Octal: 237024

Duodecimal: 3B158

Hexadecimal: 13e14

Square: 6630519184

Square Root: 285.3559181092973

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

Number of n X 3 0..2 arrays with top left element 0, horizontal differences mod 3 never 1, vertical differences mod 3 never -1, and antidiagonal differences never 0. A229397

Numbers whose base-5 representation has exactly 8 runs. A43608

Number of length n 1..(7+2) arrays with no leading or trailing partial sum equal to a prime and no consecutive values equal. A254217

T(n,k) = number of length n 1..(k+2) arrays with no leading or trailing partial sum equal to a prime and no consecutive values equal. A254218

Class 9- primes. A81428

T(n,k)=Number of nXk 0..2 arrays with top left element 0, horizontal differences mod 3 never 1, vertical differences mod 3 never -1, and antidiagonal differences never 0. A229402